Universal LED Tube Circuit for Ballast Compatibility
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Solution Overview
Problem
Existing LED lamp tubes require different driving circuit designs to be compatible with lamp fixtures that have or do not have a ballast, leading to increased manufacturing burdens and user inconvenience due to the need for multiple types of lamp tubes.
Innovation Solution
An elongated lamp tube with a first power supply circuit, a second power supply circuit, and a frequency switch circuit that allows it to be compatible with both types of lamp fixtures, capable of handling input power frequencies of 120V-277V with 50 Hz or 60 Hz, as well as converted power frequencies above 20 KHz, eliminating the need for separate designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED lamp tubes are designed with different driving circuits for ballasted and unballasted fixtures, then compatibility with both fixture types is achieved, but device complexity and manufacturing burden increase
Solution Approach 1:
The patent implements a universal driving circuit that can operate with both ballasted and unballasted fixtures by integrating multiple power processing paths within a single circuit design. The circuit automatically adapts to different input conditions (ballast output or direct line voltage) without requiring separate dedicated circuits, thereby achieving multi-functionality while controlling complexity.
Solution Approach 2:
The driving circuit incorporates dynamic switching capabilities that allow it to adapt its operating mode based on the detected input conditions. The circuit can dynamically switch between processing ballast output signals and processing direct line voltage, providing adaptability without requiring multiple static circuit designs.
2Adaptability or versatility
If manufacturers produce multiple types of LED lamp tubes for different fixture types, then fixture compatibility is ensured, but stocking burden and user inconvenience increase
Solution Approach 1:
By designing a single LED lamp tube with a universal driving circuit that can operate with both ballasted and unballasted fixtures, manufacturers eliminate the need to produce and stock multiple specialized lamp tube variants. This universal design approach directly reduces manufacturing complexity and inventory burden while maintaining broad fixture compatibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a single LED lamp tube to function with both ballasted and unballasted fixtures, reducing manufacturing and user inconvenience while ensuring compatibility with various ballast types, thus decreasing stocking pressures and enhancing flexibility.
Implementation Method 1
the frequency switch circuit is connected to the first power supply and the second power supply for blocking one of the first power supply circuit and the second power supply to supply one of the first driving current and the second driving current to the LED light source according to an input frequency of a received power from the tube electrodes
Implementation Method 2
The first power supply circuit converts the converted power of the working frequency to a first driving current supplying to the LED light source
Implementation Method 3
the second power supply circuit converts the external power of the industrial frequency to a second driving current to the LED light source
Implementation Method 4
The LED light source emits light passing through a tube surface of the elongated tube shell
Data Source
AI summary
An elongated lamp tube has an elongated tube shell, two caps, a LED light source, a first power supply circuit, a second power supply circuit and a frequency switch circuit. The elongated lamp tube may be connected to first electrodes of a lamp fixture without a ballast or a lamp fixture with a ballast. The ballast converts an external power of an industrial frequency to a converted power of a working frequency. The frequency switch circuit is connected to the first power supply and the second power supply for blocking one of the first power supply circuit and the second power supply to supply driving current to the LED light source according to an input frequency of a received power.